Red Hat Sendmail FAQ
Chapter 4. Advanced Issues
4.3 I don't have a sendmail.cw file and I've never needed one. It's not in my macro config either, but something isn't right because some mail is not being accepted. How do I tell what sendmail thinks is in class w?
As root, issue this command:
echo '$=w' | sendmail -bt -d0.4
4.2 I don't need a full mailing list manager like majordomo, so what's the best way to create a simple newsletter system without it?
4.4 We had a user leave and are forwarding his mail, but we're still getting lots of mail for him. What can we do to let people know he's moved on?